Unfortunately, one of the many, many shortcomings of Metacity is that, well, basically, you can't. You either have to use the reduced-resources mode thing that you mentioned, or get rid of metacity altogether. You may want to look at this guide to using enlightenment instead of metacity. I have not tested it lately, so I don't know how well it works... Here is the guide:
http://www.ubuntuforums.org/showthre...ightened+gnome
Or you can look at using kwin instead of metacity:
http://www.ubuntuforums.org/showthre...604#post648604
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